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#include <stdio.h>
#include <stdlib.h>
 
int main(void)
{
 FILE * fp = fopen ("from.txt", "w"); // create file "from.txt"
 if (!fp)
 {
 perror ("from.txt");
 return EXIT_FAILURE ;
 }
 fputc ('a', fp); // write to "from.txt"
 fclose (fp);
 
 int rc = rename("from.txt", "to.txt");
 if (rc)
 {
 perror ("rename");
 return EXIT_FAILURE ;
 }
 
 fp = fopen ("to.txt", "r");
 if(!fp)
 {
 perror ("to.txt");
 return EXIT_FAILURE ;
 }
 printf ("%c\n", fgetc (fp)); // read from "to.txt"
 fclose (fp);
 
 return EXIT_SUCCESS ;
}

Possible output:

a

• C23 standard (ISO/IEC 9899:2024):

• 7.21.4.2 The rename function (p: TBD)

• C17 standard (ISO/IEC 9899:2018):

• 7.21.4.2 The rename function (p: TBD)

• C11 standard (ISO/IEC 9899:2011):

• 7.21.4.2 The rename function (p: 302-303)

• C99 standard (ISO/IEC 9899:1999):

• 7.19.4.2 The rename function (p: 268-269)

• C89/C90 standard (ISO/IEC 9899:1990):

• 4.9.4.2 The rename function